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Message-ID:
 <TY3PR01MB113467D8E13143E412B119270864CA@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Sun, 6 Jul 2025 09:55:28 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Russell King <linux@...linux.org.uk>
CC: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>, Andrew
 Lunn <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre
 Torgue <alexandre.torgue@...s.st.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-renesas-soc@...r.kernel.org"
	<linux-renesas-soc@...r.kernel.org>,
	"linux-stm32@...md-mailman.stormreply.com"
	<linux-stm32@...md-mailman.stormreply.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Geert Uytterhoeven <geert+renesas@...der.be>,
	biju.das.au <biju.das.au@...il.com>
Subject: RE: [PATCH net-next] net: stmmac: dwmac-renesas-gbeth: Add PM
 suspend/resume callbacks



> -----Original Message-----
> From: Biju Das
> Sent: 06 July 2025 09:45
> Subject: RE: [PATCH net-next] net: stmmac: dwmac-renesas-gbeth: Add PM suspend/resume callbacks
> 
> Hi Russell King,
> 
> > -----Original Message-----
> > From: Biju Das <biju.das.jz@...renesas.com>
> > Sent: 05 July 2025 21:27
> > Subject: RE: [PATCH net-next] net: stmmac: dwmac-renesas-gbeth: Add PM
> > suspend/resume callbacks
> >
> >
> >
> > > -----Original Message-----
> > > From: Russell King <linux@...linux.org.uk>
> > > Subject: Re: [PATCH net-next] net: stmmac: dwmac-renesas-gbeth: Add
> > > PM suspend/resume callbacks
> > >
> > > On Sat, Jul 05, 2025 at 06:03:24PM +0100, Biju Das wrote:
> > > > Add PM suspend/resume callbacks for RZ/G3E SMARC EVK.
> > > >
> > > > The PM deep entry is executed by pressing the SLEEP button and
> > > > exit from entry is by pressing the power button.
> > > >
> > > > Logs:
> > > > root@...rc-rzg3e:~# PM: suspend entry (deep) Filesystems sync:
> > > > 0.115 seconds Freezing user space processes Freezing user space
> > > > processes completed (elapsed 0.002 seconds) OOM killer disabled.
> > > > Freezing remaining freezable tasks Freezing remaining freezable
> > > > tasks completed (elapsed 0.001 seconds)
> > > > printk: Suspending console(s) (use no_console_suspend to debug)
> > > > NOTICE:  BL2: v2.10.5(release):2.10.5/rz_soc_dev-162-g7148ba838
> > > > NOTICE:  BL2: Built : 14:23:58, Jul  5 2025
> > > > NOTICE:  BL2: SYS_LSI_MODE: 0x13e06
> > > > NOTICE:  BL2: SYS_LSI_DEVID: 0x8679447
> > > > NOTICE:  BL2: SYS_LSI_PRR: 0x0
> > > > NOTICE:  BL2: Booting BL31
> > > > renesas-gbeth 15c30000.ethernet end0: Link is Down Disabling
> > > > non-boot CPUs ...
> > > > psci: CPU3 killed (polled 0 ms)
> > > > psci: CPU2 killed (polled 0 ms)
> > > > psci: CPU1 killed (polled 0 ms)
> > > > Enabling non-boot CPUs ...
> > > > Detected VIPT I-cache on CPU1
> > > > GICv3: CPU1: found redistributor 100 region 0:0x0000000014960000
> > > > CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
> > > > CPU1 is up
> > > > Detected VIPT I-cache on CPU2
> > > > GICv3: CPU2: found redistributor 200 region 0:0x0000000014980000
> > > > CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
> > > > CPU2 is up
> > > > Detected VIPT I-cache on CPU3
> > > > GICv3: CPU3: found redistributor 300 region 0:0x00000000149a0000
> > > > CPU3: Booted secondary processor 0x0000000300 [0x412fd050]
> > > > CPU3 is up
> > > > dwmac4: Master AXI performs fixed burst length 15c30000.ethernet end0:
> > > > No Safety Features support found 15c30000.ethernet end0: IEEE
> > > > 1588-2008 Advanced Timestamp supported 15c30000.ethernet end0:
> > > > configuring for phy/rgmii-id link mode
> > > > dwmac4: Master AXI performs fixed burst length 15c40000.ethernet end1:
> > > > No Safety Features support found 15c40000.ethernet end1: IEEE
> > > > 1588-2008 Advanced Timestamp supported 15c40000.ethernet end1:
> > > > configuring for phy/rgmii-id link mode OOM killer enabled.
> > > > Restarting tasks: Starting
> > > > Restarting tasks: Done
> > > > random: crng reseeded on system resumption
> > > > PM: suspend exit
> > > >
> > > > 15c30000.ethernet end0: Link is Up - 1Gbps/Full - flow control
> > > > rx/tx root@...rc-rzg3e:~# ifconfig end0 192.168.10.7 up
> > > > root@...rc-rzg3e:~# ping 192.168.10.1 PING 192.168.10.1
> > > > (192.168.10.1) 56(84) bytes of data.
> > > > 64 bytes from 192.168.10.1: icmp_seq=1 ttl=64 time=2.05 ms
> > > > 64 bytes from 192.168.10.1: icmp_seq=2 ttl=64 time=0.928 ms
> > >
> > > You should also test with the interface configured before
> > > suspend/resume and confirm that it continues working afterwards without being reconfigured.
> >
> > Yes, I confirm it works without reconfiguration.
> >
> > Please see the logs:
> > root@...rc-rzg3e:~# ifconfig
> > eth0: flags=-28605<UP,BROADCAST,RUNNING,MULTICAST,DYNAMIC>  mtu 1500
> >         inet 192.168.10.7  netmask 255.255.255.0  broadcast 192.168.10.255
> >         ether 00:11:22:33:44:55  txqueuelen 1000  (Ethernet)
> >         RX packets 35  bytes 2208 (2.1 KiB)
> >         RX errors 0  dropped 0  overruns 0  frame 0
> >         TX packets 27  bytes 5368 (5.2 KiB)
> >         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
> >         device interrupt 20
> >
> > root@...rc-rzg3e:~# ping 192.168.10.1
> > PING 192.168.10.1 (192.168.10.1) 56(84) bytes of data.
> > 64 bytes from 192.168.10.1: icmp_seq=1 ttl=64 time=0.866 ms
> > 64 bytes from 192.168.10.1: icmp_seq=2 ttl=64 time=0.900 ms
> > 64 bytes from 192.168.10.1: icmp_seq=3 ttl=64 time=0.938 ms
> > 64 bytes from 192.168.10.1: icmp_seq=4 ttl=64 time=0.929 ms
> > 64 bytes from 192.168.10.1: icmp_seq=5 ttl=64 time=0.890 ms
> > 64 bytes from 192.168.10.1: icmp_seq=6 ttl=64 time=1.02 ms
> > [   75.812501] PM: suspend entry (deep)
> > [   75.849939] Filesystems sync: 0.033 seconds
> > [   75.855680] Freezing user space processes
> > [   75.861550] Freezing user space processes completed (elapsed 0.001 seconds)
> > [   75.868559] OOM killer disabled.
> > [   75.871788] Freezing remaining freezable tasks
> > [   75.877342] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
> > [   75.884724] printk: Suspending console(s) (use no_console_suspend to debug)
> > NOTICE:  BL2: v2.10.5(release):2.10.5/rz_soc_dev-162-g7148ba838
> > NOTICE:  BL2: Built : 14:23:58, Jul  5 2025
> > NOTICE:  BL2: SYS_LSI_MODE: 0x13e06
> > NOTICE:  BL2: SYS_LSI_DEVID: 0x8679447
> > NOTICE:  BL2: SYS_LSI_PRR: 0x0
> > NOTICE:  BL2: Booting BL31
> > [   75.939455] renesas-gbeth 15c30000.ethernet eth0: Link is Down
> > [   75.948464] Disabling non-boot CPUs ...
> > [   75.952584] psci: CPU3 killed (polled 0 ms)
> > [   75.957722] psci: CPU2 killed (polled 0 ms)
> > [   75.963385] psci: CPU1 killed (polled 4 ms)
> > [   75.967815] Enabling non-boot CPUs ...
> > [   75.968025] Detected VIPT I-cache on CPU1
> > [   75.968069] GICv3: CPU1: found redistributor 100 region 0:0x0000000014960000
> > [   75.968107] CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
> > [   75.968786] CPU1 is up
> > [   75.968882] Detected VIPT I-cache on CPU2
> > [   75.968902] GICv3: CPU2: found redistributor 200 region 0:0x0000000014980000
> > [   75.968922] CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
> > [   75.969351] CPU2 is up
> > [   75.969446] Detected VIPT I-cache on CPU3
> > [   75.969466] GICv3: CPU3: found redistributor 300 region 0:0x00000000149a0000
> > [   75.969486] CPU3: Booted secondary processor 0x0000000300 [0x412fd050]
> > [   75.969980] CPU3 is up
> > [   75.987181] dwmac4: Master AXI performs fixed burst length
> > [   75.988097] renesas-gbeth 15c30000.ethernet eth0: No Safety Features support found
> > [   75.988117] renesas-gbeth 15c30000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
> > [   75.991717] renesas-gbeth 15c30000.ethernet eth0: configuring for phy/rgmii-id link mode
> > [   76.007851] dwmac4: Master AXI performs fixed burst length
> > [   76.008761] renesas-gbeth 15c40000.ethernet eth1: No Safety Features support found
> > [   76.008777] renesas-gbeth 15c40000.ethernet eth1: IEEE 1588-2008 Advanced Timestamp supported
> > [   76.012353] renesas-gbeth 15c40000.ethernet eth1: configuring for phy/rgmii-id link mode
> > [   76.204477] OOM killer enabled.
> > [   76.207609] Restarting tasks: Starting
> > [   76.212024] Restarting tasks: Done
> > [   76.215550] random: crng reseeded on system resumption
> > [   76.220909] PM: suspend exit
> > [   78.612495] renesas-gbeth 15c30000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
> > From 192.168.10.7 icmp_seq=7 Destination Host Unreachable From
> > 192.168.10.7 icmp_seq=8 Destination Host Unreachable From 192.168.10.7
> > icmp_seq=9 Destination Host Unreachable
> > 64 bytes from 192.168.10.1: icmp_seq=11 ttl=64 time=0.663 ms
> > 64 bytes from 192.168.10.1: icmp_seq=12 ttl=64 time=1.19 ms
> >
> 
> FYI, The above testing is done with rootFS mounted on SD card.
> 
> But when I mount rootFS on NFS, after wakeup, I am not able to contact the NFS server.
> 
> The below patch makes it to work[1].
> Not sure, why the original code is failing if the rootFS is mounted on NFS?
> 
> Cheers,
> Biju
> 
> [1]
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> index df4ca897a60c..434ef1802195 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> @@ -25,6 +25,8 @@ struct renesas_gbeth {
>         struct plat_stmmacenet_data *plat_dat;
>         struct reset_control *rstc;
>         struct device *dev;
> +
> +       bool suspend;
>  };
> 
>  static const char *const renesas_gbeth_clks[] = { @@ -50,6 +52,13 @@ static int
> renesas_gbeth_init(struct platform_device *pdev, void *priv)
>         if (ret)
>                 reset_control_assert(gbeth->rstc);
> 
> +       if (gbeth->suspend) {
> +               struct net_device *ndev = platform_get_drvdata(pdev);
> +
> +               gbeth->suspend = false;
> +               phy_init_hw(ndev->phydev);
> +       }
> +
>         return ret;
>  }
> 
> @@ -66,6 +75,8 @@ static void renesas_gbeth_exit(struct platform_device *pdev, void *priv)
>         ret = reset_control_assert(gbeth->rstc);
>         if (ret)
>                 dev_err(gbeth->dev, "Reset assert failed\n");
> +
> +       gbeth->suspend = true;
>  }

Just adding some logs:
Currently PHY resume is called twice
[   35.754933]  kszphy_resume+0x3c/0xf0
[   35.754940]  phy_resume+0x3c/0x74
[   35.754949]  phylink_prepare_resume+0x58/0xa0
[   35.754957]  stmmac_resume+0x90/0x2a0
[   35.771296]  stmmac_pltfr_resume+0x3c/0x4c

and

[   35.771258]  kszphy_resume+0x3c/0xf0
[   35.771263]  __phy_resume+0x28/0x54
[   35.771270]  phy_start+0x7c/0xb4
[   35.771275]  phylink_start+0xb8/0x210
[   35.771282]  phylink_resume+0x7c/0xc4
[   35.771288]  stmmac_resume+0x1ec/0x2a0
[   35.771296]  stmmac_pltfr_resume+0x3c/0x4c

With patch[1], there is only one kszphy_resume() call.

1) Detailed logs working case RootFS mounted on SD:

root@...rc-rzg3e:~# [   35.599061] PM: suspend entry (deep)
[   35.635942] Filesystems sync: 0.033 seconds
[   35.642070] Freezing user space processes
[   35.647741] Freezing user space processes completed (elapsed 0.001 seconds)
[   35.654826] OOM killer disabled.
[   35.658042] Freezing remaining freezable tasks
[   35.663649] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
[   35.671047] printk: Suspending console(s) (use no_console_suspend to debug)
NOTICE:  BL2: v2.10.5(release):2.10.5/rz_soc_dev-162-g7148ba838
NOTICE:  BL2: Built : 14:23:58, Jul  5 2025
NOTICE:  BL2: SYS_LSI_MODE: 0x13e06
NOTICE:  BL2: SYS_LSI_DEVID: 0x8679447
NOTICE:  BL2: SYS_LSI_PRR: 0x0
NOTICE:  BL2: Booting BL31
[   35.722047] libphy: #######phy_suspend 1908
[   35.722082] ########kszphy_suspend 2350
[   35.722142] renesas-gbeth 15c30000.ethernet eth0: Link is Down
[   35.722823] ########kszphy_suspend 2356
[   35.723183] ########kszphy_generic_suspend 2343
[   35.723215] libphy: #######phy_suspend 1925
[   35.730939] Disabling non-boot CPUs ...
[   35.734909] psci: CPU3 killed (polled 4 ms)
[   35.741526] psci: CPU2 killed (polled 0 ms)
[   35.746911] psci: CPU1 killed (polled 4 ms)
[   35.749344] Enabling non-boot CPUs ...
[   35.749557] Detected VIPT I-cache on CPU1
[   35.749601] GICv3: CPU1: found redistributor 100 region 0:0x0000000014960000
[   35.749639] CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
[   35.750293] CPU1 is up
[   35.750385] Detected VIPT I-cache on CPU2
[   35.750406] GICv3: CPU2: found redistributor 200 region 0:0x0000000014980000
[   35.750427] CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
[   35.750879] CPU2 is up
[   35.750973] Detected VIPT I-cache on CPU3
[   35.750993] GICv3: CPU3: found redistributor 300 region 0:0x00000000149a0000
[   35.751015] CPU3: Booted secondary processor 0x0000000300 [0x412fd050]
[   35.751483] CPU3 is up
[   35.754875] ########kszphy_resume 2389
[   35.754887] CPU: 1 UID: 0 PID: 281 Comm: systemd-sleep Not tainted 6.16.0-rc4-next-20250703-gf2ebaf5365aa-dirty #63 PREEMPT
[   35.754895] Hardware name: Renesas SMARC EVK version 2 based on r9a09g047e57 (DT)
[   35.754898] Call trace:
[   35.754902]  show_stack+0x18/0x24 (C)
[   35.754917]  dump_stack_lvl+0x78/0x90
[   35.754927]  dump_stack+0x18/0x24
[   35.754933]  kszphy_resume+0x3c/0xf0
[   35.754940]  phy_resume+0x3c/0x74
[   35.754949]  phylink_prepare_resume+0x58/0xa0
[   35.754957]  stmmac_resume+0x90/0x2a0
[   35.754967]  stmmac_pltfr_resume+0x3c/0x4c
[   35.754974]  device_resume+0x108/0x1ec
[   35.754983]  dpm_resume+0x198/0x1b8
[   35.754990]  dpm_resume_end+0x20/0x38
[   35.754996]  suspend_devices_and_enter+0x4a8/0x58c
[   35.755006]  pm_suspend+0x180/0x20c
[   35.755011]  state_store+0x80/0xec
[   35.755017]  kobj_attr_store+0x18/0x2c
[   35.755023]  sysfs_kf_write+0x7c/0x94
[   35.755031]  kernfs_fop_write_iter+0x120/0x1ec
[   35.755037]  vfs_write+0x238/0x370
[   35.755045]  ksys_write+0x6c/0x100
[   35.755051]  __arm64_sys_write+0x1c/0x28
[   35.755056]  invoke_syscall+0x48/0x110
[   35.755065]  el0_svc_common.constprop.0+0xc0/0xe0
[   35.755072]  do_el0_svc+0x1c/0x28
[   35.755078]  el0_svc+0x34/0xf0
[   35.755086]  el0t_64_sync_handler+0xa0/0xe4
[   35.755093]  el0t_64_sync+0x198/0x19c
[   35.755099] ########kszphy_generic_resume 2328
[   35.757673] ########kszphy_resume 2413
[   35.766674] dwmac4: Master AXI performs fixed burst length
[   35.767591] renesas-gbeth 15c30000.ethernet eth0: No Safety Features support found
[   35.767611] renesas-gbeth 15c30000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
[   35.771205] renesas-gbeth 15c30000.ethernet eth0: configuring for phy/rgmii-id link mode
[   35.771221] ########kszphy_resume 2389
[   35.771227] CPU: 1 UID: 0 PID: 281 Comm: systemd-sleep Not tainted 6.16.0-rc4-next-20250703-gf2ebaf5365aa-dirty #63 PREEMPT
[   35.771234] Hardware name: Renesas SMARC EVK version 2 based on r9a09g047e57 (DT)
[   35.771236] Call trace:
[   35.771238]  show_stack+0x18/0x24 (C)
[   35.771245]  dump_stack_lvl+0x78/0x90
[   35.771252]  dump_stack+0x18/0x24
[   35.771258]  kszphy_resume+0x3c/0xf0
[   35.771263]  __phy_resume+0x28/0x54
[   35.771270]  phy_start+0x7c/0xb4
[   35.771275]  phylink_start+0xb8/0x210
[   35.771282]  phylink_resume+0x7c/0xc4
[   35.771288]  stmmac_resume+0x1ec/0x2a0
[   35.771296]  stmmac_pltfr_resume+0x3c/0x4c
[   35.771303]  device_resume+0x108/0x1ec
[   35.771309]  dpm_resume+0x198/0x1b8
[   35.771316]  dpm_resume_end+0x20/0x38
[   35.771322]  suspend_devices_and_enter+0x4a8/0x58c
[   35.771329]  pm_suspend+0x180/0x20c
[   35.771334]  state_store+0x80/0xec
[   35.771340]  kobj_attr_store+0x18/0x2c
[   35.771345]  sysfs_kf_write+0x7c/0x94
[   35.771351]  kernfs_fop_write_iter+0x120/0x1ec
[   35.771356]  vfs_write+0x238/0x370
[   35.771363]  ksys_write+0x6c/0x100
[   35.771368]  __arm64_sys_write+0x1c/0x28
[   35.771374]  invoke_syscall+0x48/0x110
[   35.771381]  el0_svc_common.constprop.0+0xc0/0xe0
[   35.771388]  do_el0_svc+0x1c/0x28
[   35.771394]  el0_svc+0x34/0xf0
[   35.771401]  el0t_64_sync_handler+0xa0/0xe4
[   35.771407]  el0t_64_sync+0x198/0x19c
[   35.771412] ########kszphy_generic_resume 2328
[   35.773979] ########kszphy_resume 2413
[   36.018701] SDHI2-VQMMC: disabling
[   36.228208] OOM killer enabled.
[   36.231349] Restarting tasks: Starting
[   36.235635] Restarting tasks: Done
[   36.239154] random: crng reseeded on system resumption
[   36.244473] PM: suspend exit

root@...rc-rzg3e:~# [   38.520643] renesas-gbeth 15c30000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx

2) Detailed logs NON working case RootFS mounted on NFS:
NOTICE:  BL2: v2.10.5(release):2.10.5/rz_soc_dev-162-g7148ba838
NOTICE:  BL2: Built : 14:23:58, Jul  5 2025
NOTICE:  BL2: SYS_LSI_MODE: 0x13e06
NOTICE:  BL2: SYS_LSI_DEVID: 0x8679447
NOTICE:  BL2: SYS_LSI_PRR: 0x0
NOTICE:  BL2: Booting BL31
[   21.156070] libphy: #######phy_suspend 1908
[   21.156109] ########kszphy_suspend 2350
[   21.156161] renesas-gbeth 15c30000.ethernet eth0: Link is Down
[   21.156788] ########kszphy_suspend 2356
[   21.157144] ########kszphy_generic_suspend 2343
[   21.157174] libphy: #######phy_suspend 1925
[   21.165512] Disabling non-boot CPUs ...
[   21.169679] psci: CPU3 killed (polled 4 ms)
[   21.180952] psci: CPU2 killed (polled 0 ms)
[   21.188027] psci: CPU1 killed (polled 0 ms)
[   21.190677] Enabling non-boot CPUs ...
[   21.190883] Detected VIPT I-cache on CPU1
[   21.190929] GICv3: CPU1: found redistributor 100 region 0:0x0000000014960000
[   21.190967] CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
[   21.191653] CPU1 is up
[   21.191748] Detected VIPT I-cache on CPU2
[   21.191769] GICv3: CPU2: found redistributor 200 region 0:0x0000000014980000
[   21.191789] CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
[   21.192225] CPU2 is up
[   21.192321] Detected VIPT I-cache on CPU3
[   21.192341] GICv3: CPU3: found redistributor 300 region 0:0x00000000149a0000
[   21.192362] CPU3: Booted secondary processor 0x0000000300 [0x412fd050]
[   21.192879] CPU3 is up
[   21.197553] ########kszphy_resume 2389
[   21.197566] CPU: 3 UID: 0 PID: 288 Comm: systemd-sleep Not tainted 6.16.0-rc4-next-20250703-gf2ebaf5365aa-dirty #63 PREEMPT
[   21.197574] Hardware name: Renesas SMARC EVK version 2 based on r9a09g047e57 (DT)
[   21.197578] Call trace:
[   21.197581]  show_stack+0x18/0x24 (C)
[   21.197595]  dump_stack_lvl+0x78/0x90
[   21.197606]  dump_stack+0x18/0x24
[   21.197612]  kszphy_resume+0x3c/0xf0
[   21.197619]  phy_resume+0x3c/0x74
[   21.197628]  phylink_prepare_resume+0x58/0xa0
[   21.197636]  stmmac_resume+0x90/0x2a0
[   21.197646]  stmmac_pltfr_resume+0x3c/0x4c
[   21.197653]  device_resume+0x108/0x1ec
[   21.197663]  dpm_resume+0x198/0x1b8
[   21.197669]  dpm_resume_end+0x20/0x38
[   21.197675]  suspend_devices_and_enter+0x4a8/0x58c
[   21.197684]  pm_suspend+0x180/0x20c
[   21.197689]  state_store+0x80/0xec
[   21.197695]  kobj_attr_store+0x18/0x2c
[   21.197702]  sysfs_kf_write+0x7c/0x94
[   21.197709]  kernfs_fop_write_iter+0x120/0x1ec
[   21.197714]  vfs_write+0x238/0x370
[   21.197723]  ksys_write+0x6c/0x100
[   21.197729]  __arm64_sys_write+0x1c/0x28
[   21.197735]  invoke_syscall+0x48/0x110
[   21.197743]  el0_svc_common.constprop.0+0xc0/0xe0
[   21.197749]  do_el0_svc+0x1c/0x28
[   21.197756]  el0_svc+0x34/0xf0
[   21.197763]  el0t_64_sync_handler+0xa0/0xe4
[   21.197770]  el0t_64_sync+0x198/0x19c
[   21.197776] ########kszphy_generic_resume 2328
[   21.200350] ########kszphy_resume 2413
[   21.209338] dwmac4: Master AXI performs fixed burst length
[   21.210253] renesas-gbeth 15c30000.ethernet eth0: No Safety Features support found
[   21.210273] renesas-gbeth 15c30000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
[   21.213870] renesas-gbeth 15c30000.ethernet eth0: configuring for phy/rgmii-id link mode
[   21.213886] ########kszphy_resume 2389
[   21.213891] CPU: 3 UID: 0 PID: 288 Comm: systemd-sleep Not tainted 6.16.0-rc4-next-20250703-gf2ebaf5365aa-dirty #63 PREEMPT
[   21.213897] Hardware name: Renesas SMARC EVK version 2 based on r9a09g047e57 (DT)
[   21.213900] Call trace:
[   21.213902]  show_stack+0x18/0x24 (C)
[   21.213909]  dump_stack_lvl+0x78/0x90
[   21.213917]  dump_stack+0x18/0x24
[   21.213922]  kszphy_resume+0x3c/0xf0
[   21.213928]  __phy_resume+0x28/0x54
[   21.213935]  phy_start+0x7c/0xb4
[   21.213940]  phylink_start+0xb8/0x210
[   21.213948]  phylink_resume+0x7c/0xc4
[   21.213955]  stmmac_resume+0x1ec/0x2a0
[   21.213962]  stmmac_pltfr_resume+0x3c/0x4c
[   21.213969]  device_resume+0x108/0x1ec
[   21.213976]  dpm_resume+0x198/0x1b8
[   21.213982]  dpm_resume_end+0x20/0x38
[   21.213988]  suspend_devices_and_enter+0x4a8/0x58c
[   21.213995]  pm_suspend+0x180/0x20c
[   21.214001]  state_store+0x80/0xec
[   21.214006]  kobj_attr_store+0x18/0x2c
[   21.214011]  sysfs_kf_write+0x7c/0x94
[   21.214018]  kernfs_fop_write_iter+0x120/0x1ec
[   21.214023]  vfs_write+0x238/0x370
[   21.214030]  ksys_write+0x6c/0x100
[   21.214035]  __arm64_sys_write+0x1c/0x28
[   21.214041]  invoke_syscall+0x48/0x110
[   21.214048]  el0_svc_common.constprop.0+0xc0/0xe0
[   21.214055]  do_el0_svc+0x1c/0x28
[   21.214062]  el0_svc+0x34/0xf0
[   21.214068]  el0t_64_sync_handler+0xa0/0xe4
[   21.214074]  el0t_64_sync+0x198/0x19c
[   21.214080] ########kszphy_generic_resume 2328
[   21.216646] ########kszphy_resume 2413
[   22.661587] OOM killer enabled.
[   22.668623] Restarting tasks: Starting

[   22.673694] Restarting tasks: Done
[   22.677226] random: crng reseeded on system resumption
[   22.682799] PM: suspend exit
root@...rc-rzg3e:~# [   23.801866] renesas-gbeth 15c30000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx

3) Detailed logs working case RootFS mounted on NFS with patch[1] above:

root@...rc-rzg3e:~# [   20.859463] PM: suspend entry (deep)
[   20.863297] Filesystems sync: 0.000 seconds
[   20.870616] Freezing user space processes
[   20.876719] Freezing user space processes completed (elapsed 0.001 seconds)
[   20.883685] OOM killer disabled.
[   20.886912] Freezing remaining freezable tasks
[   20.892475] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
[   20.899863] printk: Suspending console(s) (use no_console_suspend to debug)
NOTICE:  BL2: v2.10.5(release):2.10.5/rz_soc_dev-162-g7148ba838
NOTICE:  BL2: Built : 14:23:58, Jul  5 2025
NOTICE:  BL2: SYS_LSI_MODE: 0x13e06
NOTICE:  BL2: SYS_LSI_DEVID: 0x8679447
NOTICE:  BL2: SYS_LSI_PRR: 0x0
NOTICE:  BL2: Booting BL31
[   20.953817] libphy: #######phy_suspend 1908
[   20.953853] ########kszphy_suspend 2350
[   20.953912] renesas-gbeth 15c30000.ethernet eth0: Link is Down
[   20.954530] ########kszphy_suspend 2356
[   20.954880] ########kszphy_generic_suspend 2343
[   20.954911] libphy: #######phy_suspend 1925
[   20.963329] Disabling non-boot CPUs ...
[   20.967649] psci: CPU3 killed (polled 0 ms)
[   20.975948] psci: CPU2 killed (polled 0 ms)
[   20.984986] psci: CPU1 killed (polled 0 ms)
[   20.990162] Enabling non-boot CPUs ...
[   20.990375] Detected VIPT I-cache on CPU1
[   20.990419] GICv3: CPU1: found redistributor 100 region 0:0x0000000014960000
[   20.990456] CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
[   20.991154] CPU1 is up
[   20.991248] Detected VIPT I-cache on CPU2
[   20.991269] GICv3: CPU2: found redistributor 200 region 0:0x0000000014980000
[   20.991289] CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
[   20.991736] CPU2 is up
[   20.991833] Detected VIPT I-cache on CPU3
[   20.991854] GICv3: CPU3: found redistributor 300 region 0:0x00000000149a0000
[   20.991875] CPU3: Booted secondary processor 0x0000000300 [0x412fd050]
[   20.992378] CPU3 is up
[   21.068746] dwmac4: Master AXI performs fixed burst length
[   21.069681] renesas-gbeth 15c30000.ethernet eth0: No Safety Features support found
[   21.069701] renesas-gbeth 15c30000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
[   21.073298] renesas-gbeth 15c30000.ethernet eth0: configuring for phy/rgmii-id link mode
[   21.073315] ########kszphy_resume 2389
[   21.073325] CPU: 1 UID: 0 PID: 285 Comm: systemd-sleep Not tainted 6.16.0-rc4-next-20250703-gf2ebaf5365aa-dirty #64 PREEMPT
[   21.073332] Hardware name: Renesas SMARC EVK version 2 based on r9a09g047e57 (DT)
[   21.073336] Call trace:
[   21.073340]  show_stack+0x18/0x24 (C)
[   21.073354]  dump_stack_lvl+0x78/0x90
[   21.073364]  dump_stack+0x18/0x24
[   21.073370]  kszphy_resume+0x3c/0xf0
[   21.073377]  __phy_resume+0x28/0x54
[   21.073385]  phy_start+0x7c/0xb4
[   21.073390]  phylink_start+0xb8/0x210
[   21.073398]  phylink_resume+0x7c/0xc4
[   21.073404]  stmmac_resume+0x1ec/0x2a0
[   21.073413]  stmmac_pltfr_resume+0x3c/0x4c
[   21.073420]  device_resume+0x108/0x1ec
[   21.073429]  dpm_resume+0x198/0x1b8
[   21.073435]  dpm_resume_end+0x20/0x38
[   21.073441]  suspend_devices_and_enter+0x4a8/0x58c
[   21.073450]  pm_suspend+0x180/0x20c
[   21.073456]  state_store+0x80/0xec
[   21.073462]  kobj_attr_store+0x18/0x2c
[   21.073469]  sysfs_kf_write+0x7c/0x94
[   21.073476]  kernfs_fop_write_iter+0x120/0x1ec
[   21.073481]  vfs_write+0x238/0x370
[   21.073489]  ksys_write+0x6c/0x100
[   21.073496]  __arm64_sys_write+0x1c/0x28
[   21.073502]  invoke_syscall+0x48/0x110
[   21.073510]  el0_svc_common.constprop.0+0xc0/0xe0
[   21.073517]  do_el0_svc+0x1c/0x28
[   21.073523]  el0_svc+0x34/0xf0
[   21.073531]  el0t_64_sync_handler+0xa0/0xe4
[   21.073537]  el0t_64_sync+0x198/0x19c
[   21.073543] ########kszphy_generic_resume 2328
[   21.076110] ########kszphy_resume 2413
[   22.393352] OOM killer enabled.
[   22.400389] Restarting tasks: Starting

[   22.405808] Restarting tasks: Done
[   22.409360] random: crng reseeded on system resumption
[   22.414809] PM: suspend exit
root@...rc-rzg3e:~# [   23.786523] renesas-gbeth 15c30000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[   24.929734] 8021q: 802.1Q VLAN Support v1.8
[   24.934021] 8021q: adding VLAN 0 to HW filter on device eth0


Cheers,
Biju


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